The Use of Sarum (or Use of Salisbury, also known as the Sarum Rite) is the Latin liturgical rite developed at Salisbury Cathedral and used from the late eleventh century until the English Reformation. It is largely identical to the Roman rite, with about ten per cent of its material drawn from other sources. The cathedral's liturgy was widely respected during the late Middle Ages, and churches throughout the British Isles and parts of northwestern Europe adapted its customs for celebrations of the Eucharist and Liturgy of the Hours. The use has a unique ecumenical position in influencing and being authorized by Roman Catholic, Eastern Orthodox, and Anglican churches.